Configurable Low/High Side Switches

Configurable low-side and high-side switches, in ST BCD proprietary technology, are ISO26262 compliant, a standard for functional safety of electrical and/or electronic in automotive systems.

Protected against overtemperature, overcurrent, overvoltage, and electrostatic discharge (ESD) conditions, our high-side, and low-side switches are designed to work from -40 to +150°C temperature range and meet or exceed the automotive industry’s requirements.

The circuit shown the capability of configurable high and low side switch to drive relais and LEDs.


Configurable low-side and high-side switches are used to drive small automotive loads often in combination with other ST automotive products.

The main possible applications are:

These devices are typically controlled via the SPI serial wire interface and have protection and diagnostic features.

Product types:

Multiple solutions with configurable high-side and low side switches housed on a single IC.
4, 6, 8 channels high-side or low-side drivers with RDSon from 300 mΩ to 750 mΩ in a wide package solution. The 8 channel pre-driver is also part of this family with self configuring outputs for either low-side or high-side drivers.

Discover our portfolio

ST offers a wide choice of devices from 4 to 8 channels with high flexibility and configurability (LS only, HS/LS configurable, valve driver, pre-driver). The availability of products with different channels gives customers the opportunity to find the right solution for their application.

Visual description of high side/low side configurable product family


  • High flexibility and configurability
  • Advanced diagnostic and protection functionalities
  • Limp home mode for the new devices (L9026-L9800)
  • Green product (RoHS compliant)
  • Full set of diagnostics for load current and battery voltage.


Main features of family representatives:

  Package Advanced features
L9800 - 8 channels TFQFN24
  • Limp Home mode to improve safety level
  • Vbatt up to 36 V
  • Small package dimension
L9026 - 8 channels HTSSOP24
  • Bulb inrush mode
  • Green product (RoHS compliant)
  • Vbatt up to 36 V
  • Limp Home mode to improve safety level
L9305 - 4 channels PowerSSO 36
  • Max precision current accuracy
  • 1-4 high side fails safe ENABLE switch predriver with VDS monitoring
  • Redundancy of the current measurement for each channel